Penumbra is a free online rhythm game running on the Poly Engine, available at fnf.gosprunki.net. This FNF experience features smooth performance and custom charting.
Powered by Poly Engine 0.1.2.9. Credits: @SobbleGod for song porting and engine modifications, @FlyingMusicNote for creating the engine, @Shmish21 for input and charting system, and @ne_la for chart compilation. Report bugs to @Ceemech.